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= 9PL
9PL = 6.300
PL = 6.300 / 9
PL = 700
P : L = 7 : 4
7x * 4x = 700
28x² = 700
x² = 700 / 28
x² = 35
x = √25
x = 5
panjang = 5 * 7 = 35 cm
lebar = 5 * 4 = 20 cm